A woman killed by a bear at one of Canada’s major oil sands sites on Wednesday was with several workers who tried in vain to scare the animal away. The 36-year-old Suncor employee was an instrument technician who was doing electrical work at a job site near Fort McMurray, Alta., when the bear attacked her Wednesday.

Multimedia

“It was … seven people that were working in a group area and she was attacked by this bear out of that group and dragged off,” said Scott Doherty, a spokesman for Unifor.

“People tried to stop it and do everything they could. Obviously they are fairly horrified at what they saw and witnessed.”

Suncor said the employees were working in a busy industrial area and were not carrying bear spray.

Another union official said the woman’s co-workers blasted air horns to startle the animal, but to no effect.

RCMP later killed an adult black bear and tests were being done to determine whether it was the same animal that mauled the woman.

Alberta occupational health and safety said companies that operate in the region have protocols to try to prevent such attacks.

Mr. Doherty said there needs to be a full review of what happened.

“We need to be part of the investigation and review what took place there,” he said.

“If there needs to be a revision or some additional procedures and policies in place to ensure the safety of workers from wildlife attacks, we are definitely going to do that.”

Friends identified the woman as Lorna Weafer, and many people commented on her death on a Facebook memorial page.

Actor Alan O’Neill who has appeared on the TV show Sons of Anarchy, wrote in a tweet: “Heartbreaking & devastating news for all my family at the very tragic passing of my beautiful vivacious cousin in Canada. #RIPLornaWeafer.”

Alberta Environment estimates there are more than 40,000 black bears in the province. At this time of year the bears are coming out of months of hibernation and are looking for food. Average adult males can weigh as much as 200 kilograms.

Prior to Wednesday’s attack, the last time a black bear killed someone in Alberta was in 1980, when two people were mauled near Zama, a remote community near the Northwest Territories boundary.

Bear expert Stephen Herrero said fatal encounters with the bears are exceedingly rare. One or two people are killed each year in North America, which has a black bear population of almost one million.

“They should always carry accessible bear spray with them,” said Prof. Herrero, a University of Calgary professor.

Sneh Seetal, a Suncor spokeswoman, said employees who work in the bush carry bear spray, but staff in busy industrial areas such as where the woman was attacked usually only carry air horns to scare away aggressive wildlife.

Employees are trained to avoid bears, to report any sightings and to remain vigilant, she said.

“I can confirm that an air horn was sounded and workers immediately came and tried to intervene,” she said. “Despite their efforts, our employee was unable to be saved.”

Black bears have been a problem in northeastern Alberta in the past. In 2011, wildlife officers destroyed 145 black bears, including animals attracted to garbage near work camps.

An Alberta government document on bears says the animals are attracted to the smell of human-produced garbage and other waste, including petroleum products.